Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 905 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a battery cell (d) dry yeast
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a comb
5. 5.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
7. 7.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) a magnet (d) salt
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
10. 10.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) a magnet
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the amount of sugar (b) the same bottles (c) the water temperature (d) size of the balloon
12. 12.True or false: warm water is something yeast needs. (a) False (b) True
13. 13.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a magnet (d) a balloon
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) dry yeast (d) turmeric powder
15. 15.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a battery cell (d) a mirror
17. 17.True or false: sugar is needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the same bottles
19. 19.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) time (d) sunlight
20. 20.True or false: warm water is something yeast does not need. (a) False (b) True
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
22. 22.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
23. 23.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
25. 25.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
26. 26.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) sugar (d) salt
27. 27.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we measure it (b) we keep it the same (c) we change it
30. 30.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
31. 31.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
32. 32.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we change it (b) we measure it (c) we keep it the same
34. 34.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
35. 35.True or false: salt is something yeast does not need. (a) False (b) True
36. 36.True or false: warm water is needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we change it (b) we keep it the same (c) we measure it
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
40. 40.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink

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